Wes McKinney created PARQUET-473:
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Summary: Develop external predicate pushdown API for column readers
Key: PARQUET-473
URL: https://issues.apache.org/jira/browse/PARQUET-473
Project: Parquet
Issue Type: New Feature
Components: parquet-cpp
Reporter: Wes McKinney
This will happen significantly downstream of where we are at right now, but we
should be planning ahead to facilitate scanning Parquet files with
externally-defined predicates as a primary use case.
I suggest that the most general (and high performance) predicate will be
batch-oriented; i.e. the predicate will be passed a batch of materialized
values from one or more columns, and it returns an array of booleans indicating
whether or not the predicate is true. We can also develop a row-by-row "scalar"
predicate API if users need that.
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